tilc08/sendai, w. namkung, march 3, 2008 message from asian linear collider steering committee...

TILC08/Sendai, W. Namkung, March 3, 2008

Message from Asian Linear Collider

Steering Committee (ALCSC)

Tohoku University

Sendai, Japan

March 3, 2008

Won Namkung, PAL


□ ALCSC is an Ad hoc Committee under ACFA.

□ It represents ACFA to ILCSC and coordinating to ILC-Asia Regional Office.

□ Prof. Shin-ichi Kurokawa is elected as the ALCSC Chair in February, 2008


ILC-related Collaboration in Asia

□ ILC-Asia MOU (2005)

CAT (Indore, India), CHEP(Daegu, Korea), IHEP(Beijing, China), KEK (Tsukuba, Japan), PAL (Pohang, Korea), TIFR (Mumbai, India)

□ ATF-MOU (2005)

IHEP, PAL, Tokyo, Kyoto, Nagoya, Waseda, KEK, SLAC, FNAL, LBNL, Cornell, CERN, DESY, Q.M.U.L., R.H.U.L, Oxford, U.C.L,

□ Core University Program (CUP) in Accelerator Science (2005):

Multi-lateral Program for 4 countries on Man-power training, exchanges, schools and Seminars

China (IHEP, C. Zhang), India (RRCAT, S. Krishnagopal ) Japan (KEK, S. Kurokawa), Korea (PAL, I. S. Ko)


Visitors to KEK in 2007 (person-days)

- Korea: 591

- China: 329

- India: 180

- Taiwan: 90

- Other Asian: 31

(Ref. Yokoya’s Presentation at CCAST Workshop in Beijing on Oct. 5, 2007)


Asian Work for STF at KEK

- Cryo-module design: IHEP

- Coupler design: IHEP - 9-cell cavity: PAL - LL single cell: IHEP - Cold BPM: PNU - Cavity design/processing: KNU, PNU

(Ref. Yokoya’s talk at CCAST Workshop in Beijing on Nov. 5, 2007)


For GDE EDR-Phase (2007~2010)(to be revised)

□ GDE EDR-MOU: - Prepared by ILCSC in February, 2008 - Work Packages for Engineering Design and R&D - To assist government level commitments - To promote outreach programs, such as publishing RDR- companion document in Chinese, Japanese, and Korean

□ Strategy for Asian HEP: - To reactivate the Subcommittees, taking into account of GDE and KEK Timelines - To promote Asian-MOU, ATF-MOU, and CUP, ALCSC Office at KEK


ALCSC: Regional Representatives (in Feb. 2008)

Shin-ichi Kurokawa (KEK, Tsukuba), ChairW. Namkung (PAL, Pohang), Vice-ChairJie Gao (IHEP, Beijing), Vice-Chair

G. Taylor (U. Melbourne, Melbourne) Rohini Godbole (IISc, Bangalore)

Satoru Yamashita (U. Tokyo, Tokyo) H. B. Park (KNU, Daegu) Y. B. Hsiung (NTU, Taipei) L.H. Khiem (IOP, Honoi) Angelina Bacala (MSU-IIT, Mindanao)


Brief Summary/Status on ILC R&D

□ Japan: (Ref. to next talk by Prof. A. Suzuki, KEK DG)

□ China: J. Gao

□ India: V. C. Sahni

□ Korea: E. S. Kim


China’s (IHEP) Efforts in ILC Collaboration

J. GAO

IHEP, CAS, Beijing

CCAST ILC Accelerator Workshop and 1st Asia ILC R&D Seminar

Nov. 5, 2007, IHEP, Beijing, China


1) ILC-IHEP (China) has made progresses in ILC collaboration.

2) In addition to regional collaboration (with KEK, etc), intercontinental collaboration is very important also and welcome, for example with LBNL on ILC damping ring and with Fermi Lab on SC RF technology.


IHEP collaborates with France under FCPPL on ILC in ATF2, high power coupler andpositron source.

IHEP will start it collaboration on ILC with SLAC next year.

IHEP ILC will strengthen its collaboration with ANL on relevant subjects, such asdamping ring, SC RF, positron source, etc.


Summary for ILC-India R&D Status

February 21, 2008

By

V. C. Sahni

R R CAT Indore, India


Loading arrangement of dies on the 200 Ton Hydraulic Press at RRCAT

Blank Loading for Forming

Half cups of finally formed parts of cavity

Trials for making 1.3 GHz cavity forming dies/machining fixtures


2 Half Cells+ beam pipe & Flanges

Assembled Cavity with

beam pipe & Flanges

Trial Prototype Elliptical Cavity Made of Two Cu Half Cells

Bead Pull Measurement Setup for Assembled Cavity

Freq. F= 1.304847183 GHz

Freq. F1= 1.304847183 GHz

F2= 1.66426 GHz

F3= 1.83880 GHz

Frequency & E-Field Measurement on Trial 1.3 GHz Cu Cavity


Screen Shot of Bead Pull Measurement Program

Plot of Measured E-Field Distribution in the Cavity

Using Bead Pull Measurement

Frequency: Computed ANSYS - 1302.0228 MHz SUPERFISH - 1301.3937 MHz CST (MWS) - 1299.4400 MHz

Measured using VNA - 1304.847183 MHz

Q Value Computed: ANSYS - 30136 SUPERFISH - 29520.8

CST MWS - 25621.2102Measured Q Value - 6990 (Low because of poor contact)


Simulation of Fields in RF Cavities1.3 GHz Cavity

31.6 MHz Indus-1 Cavity


*Current approach to material qualification for SC-RF cavities mainly relies on improving the residual resistivity ratio (RRR) of the SC. Involves expensive Niobium refinement process.

*With high RRR Nb + right cavity shape + BCP/EP treatment Extrinsic (+ surface) defects are low & so multipacting reduces.

*But high RRR does not say how good are the SC properties of Nb & at best gives indirect information on thermal conductivity. *All cavities fabricated in the same way don’t give high gradients.

Scheme for Qualifying Niobium & Other Materials for Reproducible Production of Superconducting RF-Cavities Giving High Accelerating Gradients (New Patent was filed in O

ct 07 by S. B. Roy & V. C. Sahni, RRCAT, Indore)

*So a better qualification scheme is needed using HC1 since that sets an upper limit on achievable SC-RF accelerating gradients.


Figures below show how chemical treatment can affect HC1: Two large grain Nb- samples -one pristine & other a bcp treated.Gradients in these cavities correlated strongly with HC1 values.

Main content of patent: Provide a material ‘qualification scheme’ involving the measurements of HC1 and thermal conductivity to ensure that most of the SC-RF cavities give high gradients.


Nov. 5 2007

@ 1st Asia ILC R&D Seminar (IHEP)

KNU Eun-San Kim

ILC accelerator related R&D in Korea (KNU - PAL - PNU)


R&D for EDR at Korea RTML - Alternative bunch compressor

DR - Lattice / Instabilities BDS - BPMs and Jitter study for ATF2 SRF - Cavity processing and analysis - Cavity testing facility HLRF - IOT Many collaborations in ATF2 / Cavity with KEK Collaborations with other labs. are also growing. L-band BPM for ML Multipurpose control board for Modulator ……

Summary


Korean government announced to establish

“Large-scale Science Support Department” in the new

“Ministry of Education, Science and Technology.” on

Feb. 29, 2008

tilc08/sendai, w. namkung, march 3, 2008 message from asian linear collider steering committee...

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